Fiber helps decrease high blood sugar levels.For example, if you eat a foods with high glycemic index it will spike your blood sugar and provide instant energy which if not used shortly will imbalance your insulin levels and will result in fat storage and in long run may result in diabetics.

How to fix it?

Easy add some fiber to your meals if you eat white rice eat some broccoli alongside or other fiber rich vegetables in moderate amount, additionalally add some protein and healthy fats to your meals to keep your meals glycemic index low which will provide you with energy for long time.